The effect of electron beam machining,die sinking electro-discharge machining and small hole drilling electro-discharge machining on the low cycle fatigue performance of DD6 single crystal high-temperature alloy specimens were studied under conditions of 900℃and 540 MPa,and the micro morphology and fracture morphology of the film cooling holes were compared and analyzed.The result indicated that under the same experimental conditions,the gas film holes obtained by electron beam machining get the best fatigue life.The fatigue source is located around the gas film hole and the fracture characteristics of different drilling processes are similar,all of which are multi-source fractures.The fracture mainly includes fatigue crack source zone,propagation zone and instantaneous fracture zone.
关键词
DD6单晶/镍基单晶高温合金/低周疲劳
Key words
DD6 single crystal/nickel-based superalloy/low cycle fatigue
维普
万方数据